Tool-sharpener.



S. A. HUNTER.

TOOL SHARPENER.

APPLICATION FILED MAY 26, 1915.

Patented May 9,1916.

2 SHEETS-SHEET l.

S. A. HUNTER S. A. HUNTER.

TOOL SHARPENER.

APPLICATION man MAY 26. 1915.

Patented May 9,1916.

2 SHEETS-SHEET 2- E III! 32 E om I O THE COLUMBIA PLANOGRAPH c0.. WASHINGTON. D. c.

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T OOL-SHAR-PENER.

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Specification of Letters Intent.

' Patented May 9, 1916.

Application filed May 26, 1915. Serial No. 30,586.

To all whom it may concern Be it known that I, SIMON HUNTER, a citizen of the United States, residing at (-Eritiin, in the Province of Saskatchewan and. Dominiim. of Canada, have invented certain new and useful Improvements in TOOl-SlltlZ'PEBIIGI'S, of which the following is a. specification, reference being had to the accompanying drawings.

My invention relates broadly to new and useful improvements in toolsharpeners and has more particular reference to an improved device which is designed especially for use in. sharpening disks of barrows.

One of the primary objects of the invention is to provide a sharpener which comprises a supporting frame, wherein the axle carrying the harrow disks may be journaled,

and a sharpening too]. which is mountcdfor longitudinal movement through the frame whereby itmay be positioned for engage ment with any one oftheharrow disks arranged therein.

Another object is to mount the tool in such manner that it maybe oscillated to compensate for laterally protruding portions of the disks being sharpened, shouldthe disk be accompanied by suchlaterally displaced portions as a result of contact with rock or similar foreign articles when in use,

Another and important object of theinventionis to provide a disk sharpening tool having a cutting or sharpening element which is mounted for lateral and radial adjustment with respect to thefdisk to be sharpened and is accompanied by a swingingly mounted roller which is yieldably. held against the opposite side of the disk being sharpened and serves to hold the cutting element in active engagement therewith.

A further object of the invention is the provision of a disk sharpening tool in which the sharpening element and the roller by which it is held in engagement with the disk, areremovahly mounted and are adapted to be reversed as regards their relation to each other, whereby. either side of a disk may be operated upon by the sharpening element, without requiring that either the disk ortool be shifted.

Another object is to provide a holding roller which may be either rigidly or yieldably maintained in engagement with the disk to be sharpened on the side thereof opposed to the side being operated upon by the sharpening element. I

Another object of equal importance with the foregoing'is to construct a disk sharpening machine which is constructed with such regard to proportion, number and arrangement of parts that it may be cheaply manufactured, will be durable and eflicient in service and maybe easily operated.

The above, and other incidental objects of a similar nature, which will be hereinafter more specifically treated are accomplished hy such means as. are illustrated in the accompanying drawings, described in the following specification, and then more particularly pointed out in the claims which are appended hereto and form part of this application.

lVith reference tothe drawings, wherein there has been illustrated the preferred embodiment of this invention, as it is reduced to practice, and throughout the several views of which similar reference numerals designate corresponding parts, Figure 1 1s a front elevation of the sharpening machine, a por- '131011 of the, supporting structure being broken. away; Fig. 2 isa top planview; Fig. is a detail view in side elevation of the sharpening tool; Fig. i is a detail view of the modified form of holding rod for the roller arm; Fig. 5 is a detail longitudinal section taken. in a vertical plane through the rear portion of the tool, disclosing particu 'larly the manner in which the head screw is 'attached to the head bar; Fig. 6 is a dctail view looking atthe face of the guide block and showing this member in position against one of the track members, a portion of the guide block and body block of the tool being shown in section; Fig. 7 is a detail perspective view of the head bar; Fig. 8 is a detail niew of the rear end of the roller holding arm; and Fig. 9 is a detail view in longitudinal section of the bearing employed in connection with one end of the shaft or axleupon which the disks to be sharpenedare supported. I

As best disclosed as an-operativeentirety in Fig. 1 of-the accompanying drawings, the apparatus consists broadly in a supporting frame 10, wherein the disks to be sharpenedindicated at 11 are supported and a sharpening device generally designated by the letter A, which is mounted for longitudinal adjustment within the frame.

The supporting frame includes four corner legs or posts 12 connected by transverse beams l3, diagonal bracesld andthe longitudinal beams 15, which latter members are preferably secured to the lower shafts of varying length.

portions of the posts. Between the upper ends of the two front posts, extend, as best shown inFig. 2, a pair of parallel I beams 16 and 17, while at the rear of the frame and between the upper ends of the two rear posts, there is mounted a single I beam 18 which extends in parallelrelation to the beams16 and 17. These I beams 16, 17 and 18 constitute tracks,'the use of which will hereinafter become apparent. Spaced parallelbars 19 and 20 are terminally secured upon the I beams at one end of the supporting frame, as in Fig. 2. These bars are equipped with suitable bearings, which receive a stub axle 21, whereon the drive wheel B is keyed. This drive wheel meshes with a pinion C, the shaft D of which is accompanied by a belt wheel E. A'belt F may be employed in connecting the belt wheel to an engine 'or motoror other suitable power source- The inner end of the stub jaxle ex- I tends beyond the bar 20 and carries a socket 22 wherein is inserted the terminal of the shaft or axle 23 which carries the disks 11. A set screw 24 is provided for the socket to secure the shaft 23 against rotation therein. This shaft 23 is the shaft which carries the disks 11, when these members are supported within the horrow frame and is in practice removed from the harrow and mounted in the supporting frame above described, when i the disks are to be sharpened.

Insupporting the shaft 23, I employ a pair ofstransverse beams24l and 25. The beam 2% is mounted upon the I beams adjacent to the bar 20 and has a suitable bearing 39" for the shaft 23. The beam 25 is mounted for movement longitudinally upon the I beam. in order that it may be positioned at different points to accommodate disk The bearing 39 carried by the beam 25 is illustrated in detail in Fig. 9, to which figure reference will now be had. The bearing is provided at its inner end with an inwardly directed annular lip 41 which is triangular in cross section and, therefore, engages only a small area of the shaft so that the friction between the shaft 23 and the bearing is reduced to a minimum. A plug havinga longitudinally threaded boreis threaded into the outer end of the bearing. Through this plug isthreaded the screw 54, the inner end of-which carries a block which, as shown in Fig. 9, may be adjusted to bear lightly against the pointed end of't he shaft 23. U clamps 67 may, as

shown in Figs. 1 and 2, be employed to secure the beam 25 in adjusted position upon the beams 17 and 18 and, as herein disclosed,

beam 25 and a flange of each of the beams 17 and 18 and the lower extremities of the clamps are provided with the binding screws 68 coacting with the flanges of the beams 17 and 18 in order to effectively maintain the clamps in' applied position yet permitting The sharpening deyice heretofore designated as an entirety by the letter A, is mounted for longitudinal adjustment upon the pair of track rails 16 and 17 and is secured in adjusted position by a means to be hereinafter described. The sharpening tool includes a rectangular body block 26, a slidable head bar 27, in which the sharpening element 28' is mounted, a swingingly mounted arm 29 in which the holding roller 30 is j ournaled, a setting screw 31, by means of which the roller is adjusted, and a head screw 32 which is employed in adjusting the headbar- The body block 26 is provided in its upper face with a longitudinally extending groove 01' channel 33, through which the head bar is adapted to slide. The rear end of the 'nut 36 to receivethe head screw 32.

The head bar 27, which as best shown in detail in Fig. 7, is in length approximately equal to the length of the body block and is provided at its forward end with a socket inner end of the head bar 27 and said 7 The sharpening element 28 is maintained in applied position through the medium of the clamping member 38 which may be as desired but preferably a threaded shank provided at its outer end with a head whereby said shank may be properly rotated. At the forward endof the head block and on opposite sides thereof, are formed the laterally extending apertured ears atO. These ears are adapted for insertion through the slot 12 formed in the roller carrying arm 29 in the manner best shown in Fig. 3. A pivot pin 43 passes through this arm andthe ears. The forward end of the roller carrying arm is bent to form a substantially U-shaped yoke 44, wherein the roller heretofore designated by the numeral 30 is journaled upon an axle 4 5. Y

Therea-r end of the roller arm 29 is provided with a socket 46, wherein is pivotally mounted, by means of trunnions 47, a screw block '458 having a threaded opening, through. which the setting screw 31 ispassed. The outer end of thls setting screw is providod with a removable handle 48 and the inner end of this screw carries a head'block 4,9 which isadapted to bear against the.

bracket plate 55 of the head bar, as shown in Fig. A pair of these bracket plates extend from opposite sides of the head bar, adjacent to the rear end thereof. It will be seen that the screw rod 31 is swingingly mounted with respect to the roller arm 29 and that it may be adjusted to swing the holding roller to the proper position for maintaining the sharpening element in engagement with the face of the disk being operated upon." The screw rod above described is employed when i't is desired to maintain the roller in relatively fixed relation to the members 28. j

lVhen it is desired that the roller be yieldably held against the face of the disk, as when this member is accompanied by numerous indentationsand projections resulting from rocks and the like, I employ a modified form .of'adjusting rod shown in detail in Fig. l. This adjusting rod is provided at one end with a head block 51 and is threaded at its other end to receive a wing nut 52. A helical'spring 53 is wound.

rod may be employed in yieldably holding the roller and consequently the sharpening members 28 against the face of the disk.

The lower face of the head bar is provided adjacent to the rear terminal of this member with a relatively large recess/56. Leading from this recess is a horizontal opening 57, through which the head screw 32 passes. The forward end of, this head screw is disposed within the recess 56 and is held against withdrawal therefrom by a block 59 and a pin 60. I

From as much of the description as has now been given, it will be apparent that the cutting element 28 may be radially adjusted with respect to the disk to be operated upon by means of the head screw and that the roller may be either yieldably or rigidly engaged against the opposite face of the disk for maintaining the element 28 in engagement therewith.

As a means for attaching the body block to the track rails 16 and 17, I employ a guide block 62 and a substantially L-shaped attaching bracket 63. The block 62 is adapted to be disposed between the rails and is provided on opposite faces with a pair of parallel grooves which receive the flanges of the rails. The block is keyed by a pin 64 on an axle 65, which is journaled at its upper end in the body block 26 and at its lower terminal in; a horizontal arm of the bracket (38. The, lower end of this axle is threaded to receive a clamping handle (56, by means of which the horizontal arm of the bracket may be forced against the tracks 16 and 17 and clamped against turning movement. The tightening of the member 66 also serves to clamp the block against movement. Thus the body block 26 of the tool is held against rotative and longitudinal movement since its two points of support, the axle and the L bracket, are held in fixed position. lillhen the clamping handle is loosened, the body block is, of course, adapted to swing about the axle 65 so that the cutting memb91128 and holding, roller may swing to accommodate indentations or protrusions in Q'O I i then positioned opposite the first disk to be sharpened. If the disk has been considerably damaged and its periphery is wavering, so that element or member 28 would unevenly out into the face of the disk, were it (the elem'ent or member 28) maintained in fixed position, the clamping handle is loosened so that the body block may be swung about the axle 65, as an axis. When the bodyblock is thus free. it is obvious that irregularities in the face of the disk.

will be compensated for. since the element or member 28 and the holding roller will swing laterally as the distorted portionsof the disk pass between them. The sharpening element or member 28' may be brought into engagement with the proper portions of disksof different diameters, without requiring that the position of the disks within I the frame be varied or the track rails moved, it being only necessary to manipulate the head screw 32. After the first disk has been cut, the guide block may be shifted longitudinally on the rails to dispose the sharpenelement 28 with respect to the disk being 'the face of the disk, regardless of the particular angle which the roller carrying arm bears to the body block.

In reduction to practice, it has been found that the form of thi s invention illustrated in the drawings and referred to in the above description as the preferred embodiment, is the most efiicient and practical; yet realizing that the conditions concurrent with the adoption of this device will necessarily vary, it is desirable to emphasize the fact that various minor changes in the details of construction, proportion and arrangement of parts may be resorted to, when required, without sacrificing any of the advantages of this invention, as defined by the appended claims; 7 I

What is claimed is 1-,

1. A disk sharpening machine including a supporting frame wherein disks to be sharpened may be rotatably supported, a. pair of parallel tracks extending longitudi nally through the frame in parallel relation to the axis of rotation ofthe disks to be sharpened, a guide block supported between the tracks and movable longitud'inally carrier and 'having its horizontal arm disposed beneath the guide block for supporting the same, and means engageable with thehorizontal arimof the bracket forcl'amping the carrier upon the guide block Whereby the carrier may beheld against rotation thereon.

21 A disk sharpener including a body block, a head block slidable longitudinally therein, a head screw detachably connected to the body block, a screw plate formed integrally with the body block and receiving the head screw,.a socket formed at the forward end of thehead block, avsharpening element removably mounted in the socket, and means carried by the head block and engageable against a disk to be sharpened for yieldably maintaining the sharpening element in engagement therewith.

3. A' disk sharpening machine including a supporting frame wherein adisk to be sharpened may be rotatably supported, a guide block movably mounted upon the frame, a sharpening carrier rotatably mountedon the block, a bracket carried by the carrier and extending beneath the guide block for supporting the same, and means coacting with the bracket for clamping the carrier upon the guide block for holding the carrier againstrotation,

In testimony whereof I hereunto afliX my signature in the presence of two witnesses. SIMON A. HUNTER.

Witnesses WILLIAM C. WHEWELL, ADAM G. ROBERTSON.

Copies of this patent may be obtained for five cents each, by addressing, the Commissioner orratenn, wasmn t n cl" I 

